Effortless Slow Cooker Cioppino Recipe

Cioppino is a tomato-based seafood stew that is especially popular along the American West Coast. This slow cooker version lets you build a rich, savory broth during the day and add the seafood near the end, so dinner comes together with far less hands-on work than the stovetop method.

Why You’ll Love This Recipe

• Hands-off cooking: Most of the work happens in the slow cooker while you do other things.
• Simple pantry base: Canned tomatoes, stock, and common aromatics form the foundation.
• Flexible seafood: Use whatever firm fish, shrimp, or shellfish is available near you.
• Easy cleanup: One pot does most of the cooking.

Ingredients

• 1 tbsp (15 ml) olive oil
• 1 small yellow onion, finely chopped (about 1 cup)
• 1 red bell pepper, chopped
• 2 celery stalks, chopped
• 3 cloves garlic, minced
• 1 can (28 oz / 793 g) crushed tomatoes
• 1 cup (240 ml) dry white wine, optional
• 2 cups (480 ml) seafood or fish stock
• 1 tsp (5 g) dried oregano
• 1/2 tsp (1 g) red pepper flakes, or to taste
• 1 bay leaf
• 1 tsp (5 g) salt, plus more to taste
• 1/2 tsp (1 g) black pepper
• 1 lb (450 g) firm white fish, such as cod or halibut, cut into 2-inch (5 cm) pieces
• 1/2 lb (225 g) large shrimp, peeled and deveined
• 1/2 lb (225 g) mussels or clams, scrubbed and debearded
• 2 tbsp (8 g) chopped fresh parsley, for serving

Equipment You’ll Need

• 6-quart (5.7 L) or larger slow cooker
• Cutting board and sharp knife
• Ladle

How to Make Slow Cooker Cioppino

1. Sauté the aromatics (optional, about 5 minutes): Heat the olive oil in a skillet over medium heat. Add the onion, bell pepper, and celery and cook until softened, about 5 minutes. Stir in the garlic for 30 seconds more. Transfer everything to the slow cooker. This step adds depth, but you can skip it and add the raw vegetables directly.
2. Add the base ingredients: Pour in the crushed tomatoes, wine if using, stock, oregano, red pepper flakes, bay leaf, salt, and black pepper. Stir well.
3. Cook on low: Cover and cook on LOW for about 4 to 5 hours, or on HIGH for about 2 to 2.5 hours, until the vegetables are very tender and the broth tastes well blended. Cooking times vary by slow cooker, so start checking at the earlier end.
4. Add the fish: Stir in the fish chunks and gently press them under the liquid. Cover and cook on HIGH for about 15 minutes.
5. Add the shrimp and shellfish: Add the shrimp and mussels or clams on top. Cover and cook on HIGH for 15 to 20 minutes more. The shrimp should turn pink and opaque, the fish should flake easily with a fork, and the shellfish should open. Discard any mussels or clams that stay closed after cooking.
6. Taste and adjust: Remove the bay leaf. Add more salt, pepper, or red pepper flakes as needed.
7. Serve: Ladle the stew into warm bowls and top with chopped parsley.

Pro Tips for the Best Results

• Cut the fish into evenly sized pieces so it cooks at the same rate.
• Add delicate seafood at the end. Fish and shrimp can turn rubbery if they cook too long in the slow cooker.
• Scrub mussels and clams well and check for cracked shells before cooking.
• Use a seafood stock if you can find one. It adds more flavor than plain water.
• Taste the broth before adding salt, since stock and canned tomatoes vary in saltiness.

Common Mistakes to Avoid

• Overcooking the seafood: Add it in the final stage and check it early.
• Skipping the rinse: Rinse fish and shrimp briefly and pat them dry so the broth does not get watered down.
• Keeping closed shellfish: Mussels and clams that do not open after cooking should be thrown away.

Variations and Substitutions

• Lighter broth: Leave out the wine and use extra stock.
• Spicier stew: Increase the red pepper flakes or add a pinch of smoked paprika.
• Different seafood: Scallops, squid, or crab legs can be added in the final stage.
• Vegetarian option: Use vegetable stock and add chickpeas or white beans instead of seafood.

Serving Suggestions

Serve cioppino with crusty Italian bread or sourdough for dipping. A simple green salad with lemon vinaigrette adds freshness. A crisp white wine or sparkling water with lemon also pairs well.

Storage and Reheating

Store leftovers in an airtight container in the refrigerator and eat within 1 to 2 days. Reheat gently on the stovetop over low to medium heat until hot. Seafood tends to firm up when reheated, so avoid high heat. Cioppino does not freeze well because the shellfish and fish texture can become tough.

Frequently Asked Questions

Can I make cioppino ahead of time?

You can cook the tomato and vegetable base up to a day ahead and refrigerate it. Add the seafood right before serving and cook it until done.

Can I use frozen seafood?

Yes. Thaw frozen fish and shrimp in the refrigerator overnight before using them. Pat them dry before adding them to the slow cooker.

How do I know when the seafood is done?

Shrimp turn pink and opaque, fish flakes easily with a fork, and mussels or clams open. Discard any shellfish that stays closed.

Why did my cioppino turn out watery?

Excess liquid can come from frozen seafood that was not drained or from adding too much stock. Reduce the stock slightly or simmer the stew uncovered for 15 to 20 minutes before adding the seafood.

Slow Cooker Cioppino Recipe Card

Recipe Name: Effortless Slow Cooker Cioppino

Short Description: A tomato-based seafood stew made in the slow cooker with fish, shrimp, and shellfish.

Prep Time: 20 minutes

Cook Time: About 5 to 6 hours on LOW, or about 3 to 3.5 hours on HIGH, including the seafood stage

Total Time: About 5.5 to 6.5 hours

Servings: 4 to 6

Course: Dinner, Soup and Stew

Cuisine: Italian-American

Cooking Method: Slow cooker

Notes: Add the seafood during the final stage. Discard any mussels or clams that do not open.

Storage: Refrigerate leftovers in an airtight container for 1 to 2 days.

Nutrition information is an estimate and may vary depending on the ingredients and brands used.

What seafood do you like to add to your stew? Share your favorite combination in the comments.